Door-hanger.



PATENTED MAY 14, 1907. H. P. MACDONALD.

DOOR HANGER. APPLICATION rum) JAN. 2, 1907.

2 SHEETS-SHEET 1.

THE Nanms PETERS co.,'wAsHmarun. n. c.

N0. s5s,250.- PATENTED MAY 14.}1907. H. P. MACDONALD.

. DOOR HANGER; APPLIUATION FILED JAN. 2, 1907.

- 2 SHEETS-SHEET 2.

75 76 WITNESSES: 9) INVENTOR /44 ATTORNEYS THE NORRIS PETERS co, vfmsmmirnu, n. c.

UNITED STATES PATENT orrron.

HARRY P. 'MAODONALD, OF MONTOLAIR, NEW JERSEY, ASSIGNOR TO THE SNEAD & COMPANY IRON WORKS, OF JERSEY CITY, NEW JERSEY, A COR- PORATION OF NEW JERSEY.

DOOR-HANGER.

Specification of Letters Patent.

Patented May 14,1907.

Application filed January 2, 1907. Serial No. 350,401.

To all whom it may 001mm.-

Be it known that I, HARRY P. MAoDoN- ALD, a citizen of the United States, residing plicable generally to car, elevator and similar doors that open with a linear horizontal movement. I

The object of the invention is to do away with the usual track and hanger construction for sliding doors objectionable largely by reason of the accumulation of dirt in the track which interferes with the proper movements of the door. To that end myinvention provides for the suspension of the door from a system of swinging links arranged in sets and each comprising two links fulcrumed on fixed studs with their free ends connected by a floating link from which the door is directly suspended.

The invention is applicable to single or double sliding doors. For the former I prefer to use two sets of supporting members which will be similar in construction and operation. For double doors four sets will be used, two for each door, the construction being the same but the arrangement or disposition of the members of the system on one side being the reverse of that on the other, to effect the simultaneous operation of the doors I connect the two systems through the medium of sheaves and flexible bands or ropes. I

The invention will be understood by reference to the accompanying drawings in which Figure 1 is an elevation showing the invention applied to a single door, the door being open; Fig. 2 a similar view, the full lines showing the positions of the members of the system when the door is closed; Fig. 3 is an elevation showing the application of the invention to double doors, the parts being shown in position with the doors open; and Fig. 4 is a view similar to Fig. 3. with the members of'the system shown in position with the doors closed.

Similar reference numerals indicate similar parts in the several views.

Referring to Figs. 1 and 2 the numeral 1 designates a door capable of linear horizontal movements when being opened or closed, and 2 the casing comprising a sill 3 having a groove 3 therein in which the door is adapted to slide. The supporting'system for a single door comprises two upright suspension rods 4L rigidly secured to the door, preferably at the side of the top, substantially as indicated in Fig. 1. Each of these rods carries at its upper end a stud 5 on which is pivot- .ally mounted at its center a link 6, said link being horizontally disposed when the door is wholly closed or'opened. At one end each link 6 is pivoted on a stud 8 carried by the free end of a link 9, the latter being pivoted on a fixed stud at its upper end. A similar connection is made at 10 between the other end of each link 6 and the free end of a link 11 pivoted at its lower end on a fixed stud.

The links 9 and 11 with the intermediate connecting link 6 constitute a compound toggle arrangement, and in the construction illustrated these three members are of the same length so that the throw of the door is equal to the length of one ,of said members. I do not, however, wish to limit myself to the exact proportions indicated in the drawings as the lengths of the links may vary according to the extent of the opening and closing movements of the door. The links 9 and 11 must, however, be of equal length although of the building to prevent undue lateral movement of the door supporting members. These members may, however, be inclosed by a suitable casing according to the particular installation.

' In the position indicated in Fig. 1 it will be noted that the link 9 forms with the link 6 an acute angle a, and that between the links 6 and 11 is an obtuse angle 5. When the door is moved from the open position of Fig. 1 to the closed position of Fig. 2 the several members of the system will occupy the positions indicated by full lines in the'latter Fig. That is the links 9 and 11 will swing about their fixed centers, the angle a gradually enlarging until on the extreme movement of the door it equals the angleb of Fig. 1; and the angle 1) gradually decreasing until it equals the angle a of Fig. 1. During this swinging movement of thelinks 9 and 11 the floating links 6 will assume an incined position relatively to its original horizontal position, the angle of inclination increasing until the parts reach their mid position and then decreasing for the remainder of its movement until it again assumes a horizontal position at the end of the movement of the door. The two end pivotal points 8 and 10 will describe the arcs 13 and 14 respectively, the former ending where the latter begins and the two forming a compound curve: During this movement the path traced. by the pivotal point 5 at the center of each link 6 will be a substantially horizontal line corresponding to the longitu dinal axis of the links 6 thus maintaining the normal position of the door relatively to the casing. When the links are of equal length, and the angle between the links 9 and 6 equal to degrees, the two positions of the link 9 With the path traced. by the pivotal point 5 will form an equilateral triangle as shown in Fig. 2.

The'upright suspension rods 4t move in a plane in front of" the fixed studs at the lower ends of links 11 so that the movement of said rods is not interfered with.

In Figs. 3 and 4 I have shown the invention applied to double sliding doors, it being understood that each. door will have two'sets of supporting members substantially as indicated in Figs. 1 and 2, the positions of the members on one door being the reverse of those on the other. To distinguish. them I have primed the reference numerals on the right-hand door. To effect the simultaneous operation of the doors 15 and 16 I secure a sheave 17 to the links 9 and 9 directly facing each other and connecting the sheaves by crossed flexible bands or ropes 18 and 19 attached thereto at the point 20. To take up slack each band or rope is provided with a suitable turn-buckle 21. As will be understood any pull on either of the doors 15 or 16 to open or close it will be transmitted through the corresponding system of links and sheave to the sheave and system of the other door,

' causing reverse movements of the members on the two opposite sides as indicated in the drawings. The point of attachment of the bands 18 and 19 to the sheaves 17 will be such as to permit of the full opening and closing movements of the doors.

What I claim and. desire to secure by Letters Patent is 1. The combination with a door of a supporting system comprising links pivoted on fixed studs and connected by a link pivotally mounted thereon, and a suspension rod secured. to the door, said connecting link being pivotally connected with said suspension rod.

2. The combination with a door of asupporting system comprising links pivoted on fixed studs and connected by a link pivotally mounted thereon, said. links being of equal length, and a suspension rod secured to the door, said connecting link being pivotally cognectedat its center with said suspension r0 3. The combination with a door of a supporting system comprising links pivoted on fixed studs, an intermediate link pivotally connected to said first-named links, said con necting link being horizontally disposed when the door is either wholly open or closed, and a suspension rod secured to the door and on which said connecting link is pivotally mounted at its center, whereby when the door is opened or closed the extreme pivotal points of the connecting link will describe arcs about the fixed studs as centers, and the intermediate pivotal point will describe a substantially horizontal line.

4. The combination of double sliding doors adapted to move in opposite directions, a system of swinging links upon which each door is supported, a sheave included in each of said systems, said. sheave being attached to one of the links so as to rotate therewith, and crossed bands or belts con necting said sheaves, whereby the opening or closing of one door will effect a corresponding movement of the other door.

5. The combination of double sliding doors adapted to move in opposite directions, a supporting system for each of said. doors comprising links pivoted on fixed studs and connected by a link pivotally mounted. thereon, a suspension rod secured to the door, said connecting link being pivotally connected with said suspension rod, a sheave included in each of said systems, said sheave being attached to one of the links so'as to rotate therewith, and crossed bands or belts connecting said sheaves, whereby the opening or closing of one door will effect a corresponding movement of the other door.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

HARRY P. MACDONALD.

WVitnesses Rom. W. ASHLEY, M. E. MCNINOH. 

